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Stock-based compensation. (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of option activity |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Number of Shares |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 229 |  |  | $ | 4.15 |  |  |  | 229 |  |  | $ | 4.15 |
Options exercised |  |  | (22 | ) |  |  | 3.74 |  |  |  | — |  |  |  | — |
Outstanding at end of year |  |  | 207 |  |  | $ | 4.16 |  |  |  | 229 |  |  | $ | 4.15 |
Options exercisable at end of year |  |  | 207 |  |  | $ | 4.16 |  |  |  | 229 |  |  | $ | 4.15 |
Schedule of stock options by exercise price range |
|  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life (yrs.) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$ | 3.74 |  |  |  | 197 |  |  |  | 2.47 |  |  | $ | 3.74 |  |  |  | 197 |  |  | $ | 3.74 |
$ | 12.90 |  |  |  | 10 |  |  |  | 0.59 |  |  | $ | 12.90 |  |  |  | 10 |  |  | $ | 12.90 |
Schedule of unvested restricted stock activity |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value Per Share |
Unvested at December 31, 2019 |  |  | 2,201 |  |  | $ | 1.84 |
Issued |  |  | 1,663 |  |  | $ | 1.25 |
Vested |  |  | (1,290 | ) |  | $ | 2.08 |
Canceled |  |  | (314 | ) |  | $ | 1.33 |
Unvested at December 31, 2020 |  |  | 2,260 |  |  | $ | 1.34 |
Schedule of stock-based compensation expense |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Employees |  | $ | 2,025 |  |  | $ | 2,422 |
Non-employees |  |  | 654 |  |  |  | 387 |
Total stock-based compensation expense |  | $ | 2,679 |  |  | $ | 2,809 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
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